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Fair Value of Financial Instruments - Carrying Amount and Estimated Fair Value of Financial Instruments (Details) - USD ($)
$ in Thousands
Mar. 31, 2024
Dec. 31, 2023
Financial assets:    
Securities purchased with agreement to resell $ 554,022 $ 558,009
Securities held-to-maturity 2,733,059 2,775,184
Quoted market prices in an active market (Level 1)    
Financial assets:    
Securities purchased with agreement to resell 0 0
Securities held-to-maturity 0 0
Loans, net 0 0
Consumer loans held-for-sale 0 0
Commercial loans held-for-sale 0 0
Financial liabilities:    
Deposits and securities sold under agreements to repurchase 0 0
Federal Home Loan Bank advances 0 0
Subordinated debt and other borrowings 0 0
Models with significant observable market parameters (Level 2)    
Financial assets:    
Securities purchased with agreement to resell 0 0
Securities held-to-maturity 2,733,059 2,775,184
Loans, net 0 0
Consumer loans held-for-sale 105,060 104,626
Commercial loans held-for-sale 6,096 9,316
Financial liabilities:    
Deposits and securities sold under agreements to repurchase 0 0
Federal Home Loan Bank advances 0 0
Subordinated debt and other borrowings 0 0
Models with significant unobservable market parameters (Level 3)    
Financial assets:    
Securities purchased with agreement to resell 459,206 461,375
Securities held-to-maturity 0 0
Loans, net 32,086,768 31,863,583
Consumer loans held-for-sale 0 0
Commercial loans held-for-sale 0 0
Financial liabilities:    
Deposits and securities sold under agreements to repurchase 38,791,572 37,954,938
Federal Home Loan Bank advances 2,104,237 2,166,912
Subordinated debt and other borrowings 462,835 462,399
Carrying Amount    
Financial assets:    
Securities purchased with agreement to resell 554,022 558,009
Securities held-to-maturity 2,993,129 3,006,357
Loans, net 32,791,536 32,323,036
Consumer loans held-for-sale 104,586 104,217
Commercial loans held-for-sale 6,068 9,280
Financial liabilities:    
Deposits and securities sold under agreements to repurchase 39,603,443 38,749,299
Federal Home Loan Bank advances 2,116,417 2,138,169
Subordinated debt and other borrowings 425,159 424,938
Estimated Fair Value    
Financial assets:    
Securities purchased with agreement to resell 459,206 [1] 461,375
Securities held-to-maturity [1] 2,733,059 2,775,184
Loans, net [1] 32,086,768 31,863,583
Consumer loans held-for-sale [1] 105,060 104,626
Commercial loans held-for-sale [1] 6,096 9,316
Financial liabilities:    
Deposits and securities sold under agreements to repurchase [1] 38,791,572 37,954,938
Federal Home Loan Bank advances [1] 2,104,237 2,166,912
Subordinated debt and other borrowings [1] $ 462,835 $ 462,399
[1] Estimated fair values are consistent with an exit-price concept. The assumptions used to estimate the fair values are intended to approximate those that a market-participant would realize in a hypothetical orderly transaction.